<template>
  <div>
    <!-- <h1>当前求和为：{{ $store.state.sum }}</h1>
    <h3>当前求和放大10倍为：{{ $store.getters.bigSum }}</h3>
    <h3>我在：{{ $store.state.school }},学习{{ $store.state.subject }}</h3> -->
    <h1>当前求和为：{{ sum }}</h1>
    <h3>当前求和放大10倍为：{{ bigSum }}</h3>
    <h3>我在：{{ school }},学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import { mapState, mapGetters } from "vuex";

export default {
  name: "MyCount",
  data() {
    return {
      n: 1, //用户选择的数字
    };
  },
  methods: {
    increment() {
      this.$store.commit("JIA", this.n);
    },
    // 上下两个直接加减没有业务逻辑，可以直接commit，注意对比
    decrement() {
      this.$store.dispatch("jian", this.n);
      //   this.$store.dispatch(回调函数名, 参数);
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      this.$store.dispatch("jiaWait", this.n);
    },
  },
  // 借用mapState生成计算属性，从state中读取数据 （对象写法）
  // computed: { ...mapState({ sum: "sum", school: "school", subject: "subject" }) },
  computed: {
    ...mapState(["sum", "school", "subject"]),
    ...mapGetters(["bigSum"]),
  },
};
</script>

<style lang="css">
button {
  margin-left: 5px;
}
</style>
